251BK 251CM B- DECAY 1978Lo13 23NDS 202305
251BK H TYP=FUL$AUT=C. Morse$CIT=NDS 189, 111 (2023)$CUT=23-Sep-2022$
251BK c $1978Lo13: {+251}Cm produced through neutron irradiation of {+250}Cm
251BK2c collected from the debris of the 1969 HUTCH nuclear test. Observed
251BK3c |g rays produced in |b{+-} decay to states in {+251}Bk. Measured
251BK4c E{-|g}, I{-|g}, T{-1/2}, deduced {+251}Bk level scheme.
251BK cG RI$The normalization has been deduced by the evaluator based on the
251BK2cG intensity balance of the |g rays populating the 542-keV level,
251BK3cG corrected for internal conversion, and the |b-feeding intensity to
251BK4cG the 542-keV level quoted in 1978Lo13. Explicitly,
251BK5cG N=I{-|b}{+542}/(I{-|g}{+542}|a{+542}-I{-|g}{+435}|a{+435}).
251BK CG MR$IF NO VALUE GIVEN IT WAS ASSUMED MR=1.00 FOR E2/M1, MR=1.00 FOR
251BK2CG E3/M2 AND MR=0.10 FOR THE OTHER MULTIPOLARITIES
251BK cL BAND(A)$|p3/2-[521].
251BK cL SEQ(B)$|p1/2-[530].
251BK cL SEQ(C)$|p1/2-[521].
251BK cB IB$From level-scheme intensity balance.
251BK D CC$FROM BrIcc v2.3b (16-Dec-2014) 2008Ki07, "Frozen Orbitals" appr.
251CM P 0 (1/2+) 16.8 M 2 1420 20
251BK N 0.14 3 1.0 1.0
251BK L 0 (3/2-) 56 M 1 A
251BK2 L %B-=100$CONF=|p3/2-[521] (1978Lo13)
251BK cL T$From Adopted Levels
251BK B 70 4 6.16 4
251BKS B EAV=473.8 77
251BK L 32.5 6 (5/2-) A
251BK G 32.6
251BK L 35.7 10 (7/2+)
251BK2 L CONF=|p7/2+[633] (1978Lo13)
251BK cL E$Stated in 1978Lo13, citing 1970HoZN.
251BK L 269.3 14 (5/2+)
251BK2 L CONF=|p5/2+[642] (1978Lo13)
251BK G 233.6 4.1 4 [M1+E2] 1.9 13
251BKS G KC=1.3 12$LC=0.43 9$MC=0.111 15$NC=0.031 4$OC=0.0078 12$PC=0.0014 3$
251BKS G QC=6.8E-5 55
251BK B 1.7 8 7.45 21 ?
251BKS B EAV=372.7 75
251BK cB $|b{+-} feeding to this level seems too large given the spin
251BK2cB difference with the parent. A |g-ray photopeak was observed at 152.9
251BK3cB keV in in 1978Lo13 but was assigned to {+251}Cf. It may be that this
251BK4cB peak also contains a component that belongs to {+251}Bk, and would
251BK5cB fit as the decay from the 422.3 keV level to the 269.3 keV level.
251BK L 311.7 10 (1/2+)
251BK2 L CONF=|p1/2+[400] (1978Lo13)
251BK G 311.7 4.8 5 [E1] 0.04117
251BKS G KC=0.0322 5$LC=0.00668 11$MC=0.00163 3$NC=0.000447 7$OC=0.0001130 18$
251BKS G PC=2.12E-5 4$QC=1.168E-6 18
251BK B 0.7 17 7.8 11
251BKS B EAV=357.1 74
251BK L 422.3 8 (3/2-) B
251BK2 L CONF=|p1/2-[530] (1978Lo13)
251BK G 389.7 11.7 18 [M1+E2] 0.44 32
251BKS G KC=0.32 28$LC=0.085 38$MC=0.0216 85$NC=0.0060 24$OC=0.00152 62$
251BKS G PC=2.9E-4 13$QC=1.6E-5 13
251BK G 422.3 6.6 8 [M1+E2] 0.35 26
251BKS G KC=0.26 22$LC=0.067 32$MC=0.0169 72$NC=0.0047 20$OC=0.00119 52$
251BKS G PC=2.3E-4 11$QC=1.3E-5 11
251BK B 3.6 9 6.91 12
251BKS B EAV=316.8 73
251BK L 438.2 10 (1/2-) B
251BK G 438.2 11.4 7 [M1+E2] 0.32 24
251BKS G KC=0.24 20$LC=0.060 29$MC=0.0152 66$NC=0.0042 18$OC=0.00107 48$
251BKS G PC=2.06E-4 99$QC=1.20E-5 93
251BK B 2.1 6 7.12 13
251BKS B EAV=311.0 73
251BK L 542.6 8 (1/2-) C
251BK2 L CONF=|p1/2-[521] (1978Lo13)
251BK G 542.7 100.0 26 [M1+E2] 0.18 13
251BKS G KC=0.14 11$LC=0.033 17$MC=0.0082 40$NC=0.0023 11$OC=5.8E-4 29$
251BKS G PC=1.11E-4 58$QC=6.8E-6 51
251BK B 16 4 6.07 12
251BKS B EAV=273.7 72
251BK L 562.5 7 (3/2-) C
251BK G 530.0 14.9 11 [M1+E2] 0.19 14
251BKS G KC=0.14 12$LC=0.035 18$MC=0.0087 42$NC=0.0024 12$OC=6.2E-4 30$
251BKS G PC=1.19E-4 62$QC=7.2E-6 54
251BK G 562.5 9.4 30 [M1+E2] 0.16 12
251BKS G KC=0.124 96$LC=0.030 16$MC=0.0074 36$NC=0.00204 99$OC=5.2E-4 26$
251BKS G PC=1.01E-4 53$QC=6.2E-6 46
251BK B 3.7 9 6.67 12
251BKS B EAV=266.6 71
251BK L 978.4 6 (1/2-,3/2-)
251BK cL J$Stated in 1978Lo13. Possibly a vibrational state.
251BK G 415.9 1.5 6 [M1+E2] 0.37 27
251BKS G KC=0.27 23$LC=0.070 33$MC=0.0177 74$NC=0.0049 21$OC=0.00125 54$
251BKS G PC=2.4E-4 12$QC=1.4E-5 11
251BK G 435.8 1.4 5 [M1+E2] 0.32 24
251BKS G KC=0.24 20$LC=0.061 29$MC=0.0154 67$NC=0.0043 19$OC=0.00109 48$
251BKS G PC=2.1E-4 10$QC=1.22E-5 94
251BK G 945.9 1.4 7 [M1,E2] 0.043 27
251BKS G KC=0.033 22$LC=0.0072 38$MC=0.00177 91$NC=4.9E-4 25$OC=1.25E-4 65$
251BKS G PC=2.5E-5 13$QC=1.6E-6 11
251BK G 978.2 9.2 12 [M1+E2] 0.039 24
251BKS G KC=0.030 20$LC=0.0066 35$MC=0.00162 83$NC=4.5E-4 23$OC=1.15E-4 59$
251BKS G PC=2.2E-5 12$QC=1.47E-6 93
251BK B 2.1 4 5.96 11
251BKS B EAV=126.6 64